Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. thien van nam thuc ((va hanh) or (van hanh)) vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. thien van nam thuc ((va hanh) OR (van hanh)) vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. thien van nam thuc ((va hanh) or (van hanh)) vi ((cua tre) or (cuu tre))*.